| 摘要 |
<p>A cleaning device (10) for boilers and the like comprises an elongate lance body (20), the lance body carrying at least one first nozzle (45) at a point along its length for the release of a highly pressurised cleaning fluid. The lance body is driven so as to retract along and also to rotate about its axis at least partially from the working space. The lance body internally houses a first moving conduit (170) for said fluid, said first moving conduit communicating with a first fixed conduit (80) for the supply of the first cleaning fluid to said nozzles. The first fixed conduit and first moving conduit engage one another telescopically, one entering the other at a first telescopic joint incorporating a first seal. The seal can be adjusted for wear without dismantling the device, by rotation of the fixed conduit (80). A second fixed conduit (90) bring a second, lower pressure fluid into the lance tube (20) which serves as a second moving conduit.</p> |
